RE: security-basics Digest 18 Jun 2003 22:09:15 -0000 Issue 618

dave_at_netmedic.net
Date: 06/20/03

  • Next message: matt: "RE: MS Service Packs" 
    To: "'Damon McMahon'" <inst_karma@hotmail.com>, <deppdm@ornl.gov>
Date: Thu, 19 Jun 2003 18:47:01 -0400

    Unlike many Telnet services, the Microsoft Telnet Server service offers a
    method of secure logon using NTLM security. Most services allow for only a
    "clear text" logon, which sends your password across the network in an
    unencrypted form.

    Telntadmn.exe allows the following security settings.

    AllowTrustedDomain
    AltKeyMapping
    DefaultDomain
    DefaultShell
    MaxFailedLogins
    NTLM
    TermCap
    NumThreadsPerProcessor

    You can turn NTLM on with it, or edit the registry:

    HKEY_LOCAL_MACHINE\Software\Microsoft\TelnetServer\1.0
    NTLM REG_DWORD
    0x00: Disables Windows NT LAN Manager (NTLM) authentication.
    0x01: Attempts NTLM first, and then uses clear text
    authentication.
    0x02: Uses NTLM authentication only.

    Now you can force the W2000 server to use NTLMv2 only with the
    lmcompatibilitylevel REG_DWORD set to 5. I do not know how that will effect
    the telnet server but at least you can have NTLM. But the DefaultDomain
    edit in the TelnetServer key forces it to use the default domain for
    authentication. I will try to see if forcing to NTLMv2 causes the telnet to
    use NTLMv2 or does it still only use NTLM.

    I would suggest all these registry edits as well.

    machine\system\currentcontrolset\control\lsa\secureboot=4,1
    machine\system\currentcontrolset\control\lsa\fullprivilegeauditing=3,1
    machine\system\currentcontrolset\control\lsa\lmcompatibilitylevel=4,5
    machine\system\currentcontrolset\control\lsa\restrictanonymous=4,2
    MACHINE\System\CurrentControlSet\Control\Lsa\SubmitControl=4,0
    MACHINE\System\CurrentControlSet\Control\Lsa\NoLMHash\bar=4,0

    http://support.microsoft.com/default.aspx?scid=kb;EN-US;225233

    http://support.microsoft.com/default.aspx?scid=kb;EN-US;226107

    http://support.microsoft.com/default.aspx?scid=kb;en-us;201194

     
    _____________________
    Dave Kleiman
    dave@netmedic.net
    www.netmedic.net

    "High achievement always takes place in the framework of high expectation."
    Jack Kinder

     

    -----Original Message-----
    From: Damon McMahon [mailto:inst_karma@hotmail.com]
    Sent: Wednesday, June 18, 2003 22:45
    To: deppdm@ornl.gov
    Cc: security-basics@securityfocus.com
    Subject: Re: security-basics Digest 18 Jun 2003 22:09:15 -0000 Issue 618

    Dennis,

    Running windump on a Windows 2000 client and tcpdump on a MacOSX 10.1 client

    shows the login: and password: transmitted in clear text to a Windows XP
    telnet server.

    Can you specify any documentation stating NTLM is used?

    Thanks in advance,
    Damon

    >
    >The telnet built into Windows 2000 uses NTLMv2 authentication by defalt.
    >While
    >this is not 3DES or RC4, it is still not plain text.
    >
    >Dennis
    >

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